title: Mapping regions of Epstein-Barr virus (EBV) glycoprotein B (gB) important for fusion function with gH/gL.
abstract: Glycoproteins gB and gH/gL are required for entry of Epstein-Barr virus (EBV) into cells, but the role of each glycoprotein and how they function together to mediate fusion is unclear. Analysis of the functional homology of gB from the closely related primate gammaherpesvirus, rhesus lymphocryptovirus (Rh-LCV), showed that EBV gB could not complement Rh gB due to a species-specific dependence between gB and gL. To map domains of gB required for this interaction, we constructed a panel of EBV/Rh gB chimeric proteins. Analysis showed that insertion of Rh gB from residues 456 to 807 restored fusion function of EBV gB with Rh gH/gL, suggesting this region of gB is important for interaction with gH/gL. Split YFP bimolecular complementation (BiFC) provided evidence of an interaction between EBV gB and gH/gL. Together, our results suggest the importance of a gB-gH/gL interaction in EBV-mediated fusion with B cells requiring the region of EBV gB from 456 to 807.
authors.affiliation: Department of Microbiology and Immunology, The Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA.
authors.forename: Aileen E
authors.initials: AE
authors.lastname: Plate
authors.forename: Jessica J
authors.initials: JJ
authors.lastname: Reimer
authors.forename: Theodore S
authors.initials: TS
authors.lastname: Jardetzky
authors.forename: Richard
authors.initials: R
authors.lastname: Longnecker
mesh_terms: D000595:Amino Acid Sequence; D020031:Epstein-Barr Virus Infections / Q000821:virology; D004854:Herpesvirus 4, Human / Q000737:chemistry / Q000235:genetics / Q000502:physiology*; D018143:Lymphocryptovirus / Q000737:chemistry / Q000378:metabolism* / Q000502:physiology; D008562:Membrane Glycoproteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D018832:Molecular Chaperones / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D016415:Sequence Alignment; D014759:Viral Envelope Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D014764:Viral Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D053586:Virus Internalization
chemical_list: D008562:Membrane Glycoproteins; D018832:Molecular Chaperones; D014759:Viral Envelope Proteins; D014764:Viral Proteins; C558483:glycoprotein B, human herpesvirus 4; C065527:glycoprotein H, Herpesvirus 4; C103802:glycoprotein L, Human herpesvirus 4